1240400207 has 8 divisors (see below), whose sum is σ = 1256085600. Its totient is φ = 1224774144.

The previous prime is 1240400197. The next prime is 1240400297. The reversal of 1240400207 is 7020040421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1240400207 - 2¹⁰ = 1240399183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240400297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28019 + ... + 57147.

It is an arithmetic number, because the mean of its divisors is an integer number (157010700).

Almost surely, 2^1240400207 is an apocalyptic number.

1240400207 is a deficient number, since it is larger than the sum of its proper divisors (15685393).

1240400207 is an equidigital number, since it uses as much as digits as its factorization.

1240400207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29665.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 1240400207 is about 35219.3158224290. The cubic root of 1240400207 is about 1074.4526384536.

Adding to 1240400207 its reverse (7020040421), we get a palindrome (8260440628).

The spelling of 1240400207 in words is "one billion, two hundred forty million, four hundred thousand, two hundred seven".